Question Number 11283 by suci last updated on 19/Mar/17
$$\mathrm{2}{a}+{b}+\mathrm{4}{c}....\left(\mathrm{1}\right) \\ $$$${a}+\mathrm{3}{c}....\left(\mathrm{2}\right) \\ $$$$−\mathrm{3}{a}−\mathrm{4}{b}−{c}....\left(\mathrm{4}\right) \\ $$$${a}=..?? \\ $$$${b}=..?? \\ $$$${c}=..?? \\ $$